A modern form of light bulb is the LED, or light emitting diode. These use semiconductor technology and are very effective. These also come in many different forms and can be used in many different applications. For example there are LEDs that produce infrared light or ultraviolet light as well as light in the human visual spectrum.
LEDs function just like every other form of semiconducting diode. A current flows in one side and then out the other. However a current cannot flow the reverse direction through an LED. Inside the LED there is a very small hole that is part of he components. When the charge flows through this area it releases photons. These are considered the smallest quantifiable particle of light.














